EP 1220152 A3 20041124 - Embedding data in material
Title (en)
Embedding data in material
Title (de)
Dateneinbettung in Werkstoff
Title (fr)
Incorporation de données dans un matériau
Publication
Application
Priority
- GB 0029865 A 20001207
- GB 0029869 A 20001207
Abstract (en)
[origin: EP1220152A2] A spatial domain image I produced by a source 1 is combined with watermark data Ri to produce a spatial domain watermarked image I'. The watermarked image is produced by an embedder 3 according to the equation <DF>Ci'=Ci + alpha . Ri </DF> where Ci and Ci' are wavelet transform coefficients of the image, and alpha is a scaling factor, alpha is chosen so that the watermark is imperceptible in the image and to resist removal of the watermark by unauthorised processing. It is desirable that alpha has the smallest value which achieves that. If alpha is too big the watermark is perceptible in the image; if it is too small the mark may not survive processing of the image. alpha is determined from a trial decoding of the image I in a decoder 4. The decoding is that which would be used to decode the watermarked image I'. A value alpha ' is produced by a calculator S3-S8, to which an offset value is added by an adder S9 to produce alpha . This produces values of alpha over the image, which are used to scale the data Ri so as to conceal the data. An image is one example of material to which the invention is applicable. <??>The step of producing modified coefficient values Ci may not use coefficients of magnitude greater than a threshold T and does not use corresponding information symbols Ri. Alternatively, a threshold Tclip may be set. The scaling factor alpha is calculated using clipped coefficient values and coefficients Ci of magnitude less than Tclip. <IMAGE>
IPC 1-7
IPC 8 full level
G06T 1/00 (2006.01); H04N 1/32 (2006.01); H04N 1/387 (2006.01); H04N 5/92 (2006.01); H04N 7/08 (2006.01); H04N 7/081 (2006.01); H04N 7/26 (2006.01)
CPC (source: EP US)
G06T 1/0028 (2013.01 - EP US); G06T 1/005 (2013.01 - EP US); H04N 1/32154 (2013.01 - EP US); H04N 1/3217 (2013.01 - EP US); G06T 2201/0052 (2013.01 - EP US); G06T 2201/0203 (2013.01 - EP US)
Citation (search report)
- [Y] EP 1043687 A1 20001011 - CANON KK [JP]
- [X] MILLER M L ET AL: "Informed embedding: exploiting image and detector information during watermark insertion", PROCEEDINGS INTERNATIONAL CONFERENCE ON IMAGE PROCESSING, vol. 3, 10 September 2000 (2000-09-10), pages 1 - 4, XP010529388
- [X] COX I J ET AL: "WATERMARKING AS COMMUNICATIONS WITH SIDE INFORMATION", PROCEEDINGS OF THE IEEE, IEEE. NEW YORK, US, vol. 87, no. 7, July 1999 (1999-07-01), pages 1127 - 1141, XP000914457, ISSN: 0018-9219
- [X] SU P-C ET AL: "BLIND DIGITAL WATERMARKING FOR CARTOON AND MAP IMAGES", PROCEEDINGS OF THE SPIE, SPIE, BELLINGHAM, VA, US, vol. 3657, 25 January 1999 (1999-01-25), pages 296 - 306, XP000949150, ISSN: 0277-786X
- [Y] WEN-NUNG LIE ET AL: "Robust image watermarking on the DCT domain", IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS. EMERGING TECHNOLOGIES FOR THE 21ST CENTURY. IEEE CAT NO.00CH36353. PRESSES POLYTECH. UNIV. ROMANDES LAUSANNE, SWITZERLAND, vol. 1, 28 May 2000 (2000-05-28), pages 228 - 231 vol.1, XP002298071, ISBN: 0-7803-5482-6
- [Y] DUG-RYUNG KIM ET AL: "A robust data embedding using perceptual adaptive watermark", CIRCUITS AND SYSTEMS. IEEE APCCAS 1998. THE 1998 IEEE ASIA-PACIFIC CONFERENCE ON CHIANGMAI, THAILAND. PISCATAWAY, NJ, USA, 24 November 1998 (1998-11-24), pages 415 - 418, XP010319342, ISBN: 0-7803-5146-0
- [Y] DUGAD R ET AL: "A scheme for joint watermarking and compression of video", PROCEEDINGS INTERNATIONAL CONFERENCE ON IMAGE PROCESSING (CAT. NO.00CH37101) IEEE PISCATAWAY, NJ, USA, vol. 2, 10 September 2000 (2000-09-10), pages 80 - 83 vol.2, XP010529928, ISBN: 0-7803-6297-7
- [PA] BARNI M ET AL: "Watermark embedding: hiding a signal within a cover image", IEEE COMMUNICATIONS MAGAZINE, USA, vol. 39, no. 8, August 2001 (2001-08-01), pages 102 - 108, XP002288675, ISSN: 0163-6804
- [A] WILKINSON J H ET AL: "TOOLS AND TECHNIQUES FOR GLOBALLY UNIQUE CONTENT INDENTIFICATION", SMPTE JOURNAL, SMPTE INC. SCARSDALE, N.Y, US, vol. 109, no. 10, October 2000 (2000-10-01), pages 795 - 799, XP000969315, ISSN: 0036-1682
- [A] MACQ B: "LOSSLESS MULTIRESOLUTION TRANSFORM FOR IMAGE AUTHENTICATING WATERMARKING", PROCEEDINGS OF THE EUROPEAN SIGNAL PROCESSING CONFERENCE, vol. 4, 8 September 2000 (2000-09-08), pages 1973 - 1976, XP008032665
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1220152 A2 20020703; EP 1220152 A3 20041124; JP 2002271612 A 20020920; US 2002106105 A1 20020808; US 7085396 B2 20060801
DOCDB simple family (application)
EP 01310111 A 20011203; JP 2001375049 A 20011207; US 1002601 A 20011206